v0.8.1

CHANGES:

• Dunify project (@dinosaure)
• breaking-change Unbox Bytes.t and Bigstring.t as I/O buffer (@dinosaure)
• Add foreign tests vectors (@cfcs, @dinosaure)
• Catch invalid distance (@XVilka, @dinosaure)
• Better check on dictionaries (@XVilka, @dinosaure)
• breaking-change Add [wbits] argument to check Window size on RFC1951 (@XVilka, @dinosaure)